Micrometer attachment



Inventof P0361' WZJOIL Attorney v R W OLSON uIcRuETER ATTACHMENT' FiledSent. 13, 1926 May 1, 1928, g

Patented May 1, 1928.

,UNITED s'rraras vParr-:NT ori-uca.

ROBERT W. oLsoN, or BELoI'r, WISCONSIN.

MIGROMETER ATTACHMENT.

Application led September 13, 1926. Y Serial No. 135,124.

suchcharacter that a iinely developed sensel of touch is not necessaryin the operation thereof, and hence the attachment is as'accurate in thehands of an unskilled mechanic as it is in the hands of a highly skilledcraftsman. Y l

Other object-s and practical advantages of the invention will be fullyunderstood from the following description and claims when the same areread 1n connection with the drawings, accompanying and forming part ofthis specification, in which :-r

Figure 1 is aview in side elevation showingv the attachment constitutingthe preferredembodiment of my invention as properly applied to amicrometer.

Figure 2 comprises disconnected perspectives, on'enlarged scales, ot'parts of the attachment hereinafter explicitly referred to.

Similar numerals not' reference designate corresponding parts in :bothviews of the drawing.

I show in vFigure 1 a conventional micrometer having a graduated barrel1, and a thim blev 2 for cooperation with the said barrel and also forthe movement of the usual element designated by 3." l

My attachment isfastened to one arm 4 of the usual U-sha-ped portion ofthe micrometer, and itwill be noted that among other elements myattachment includes a bar 5, grooved longitudinally at 6 and aperturedat 7 and formed integral with or ixed to an arm 8 which is providedwitha teat 9 and is also providedl with `a U-shaped portion 1Q which isdesigned to straddle the end of the arm 4 and be detachably fixedthereto through the medium of a set screw 11. In addition to thebar 5yandl the arm or bracket 8, the attachment comprises a sleeve 12 slidableon the bar 5 and designed to be adjustably fixed thereto through themedium of a. set screw 13, andv equipped with an' ap-` erturedprojection14for the reception of a rod 15 which is normally pressedtoward the right through the medium ot'a spring 16 in` terposed betweenthe projection 144 and an enlargement 17 onthe rod 15. t

In one side the sleeve 12 is provided with a threaded aperture 18,Figure 2, to receive a headed screw 19 which is designed to rest in the`longitudinal slot- 2() in the rear porftionv 21 of aslidable member 22.`The said` slidable member 22 isprovided with an arcuatesca1e23 forcooperation with a swingable pom-ter 24 which 1s pivoted at in the;

member 22 and is provided with a slotted arm 26. It will also be notedthat the membei-.22 is equipped with an arm 27 of channel form at 28 andprovided on its outer side adjacent to its end witha teat 29, the saidteat 29 being designed to bear at a point op posite the aforementioned.teat 9 `incident to the taking of an inside measurenlent.A

The forward portion of the member is arranged in lapped relation to amember 30 and is held under yielding pressure against the side of thesaid member 30 by the resiliency of the arm 27; it being understood in`this connection that the member `3() is slotted at 31 to receive the bar5, and that the chan knel portion28 ot the resilient arm27 is pivotallyconnected at V32 to the member 30. It will also be understood that themember 30 hasa `Stud33 movable in the groove 6 of the bar 5 and also hasa lateral pin 34, which extends through any arcuate slot` 34X intheinner wall of the member 22 and is disposed in the slot of the arm onthe pointer 24, Wherebyswin'ging movement of the pointer 24` will attendslidingmovement of the mem ber 22. The rod 15 is pivotally connected at35 to the rear side ot' the member 30. From this it Willbe understoodthat the spring 1li will operate `to yieldingly hold the member 30against movement toward the left in Fig ure 1. Adjacentto its lower endthe membert) is provided with a teat 36 that is opposed to theforwardend ot' the micrometer element 3. I prefer that the teat be in the formofascrew threaded intoV the lower end portion `of the member 30, andthat the said teat 36 be provided with one or more minute apertures 37so thatthe shank of the said screw `may be expeditiously and easilythreaded into and out ofthe member 3() as, when it is desired ltosubstitute a smaller or larger teilt-'36 for the one illustrated.` Y

The slot or opening 31 in the member 30 isslightly larger than the bar5` to permit ot' pivotal or swinging movement of the" member 3l on thebar 5 in the direction ot' the length of said bar, the center of saidmovement of the member 30 orr bar 5 being! 'Ill the pivot connection 32between the member and the arm 27.

It will bemanifest from the'foreging that my novel attachment is readilyapplicable to and removable from a conventional mi crometer, and thatwhen applied as shown in Figure 1, the attachment is susceptible of usewith great facility.

The device as shown in Figurcl is capable of taking inside measurementsin thousandths of an inch from about eight-r sixteenths of an inchupward, and manifestly the low limit of the device will be determined bythe design and construction, and the smaller the size of the device, themeasurements of which are'to'be taken, the more useful will my noveldevice be found.

In the operation of my improvement the screw 13 is loosened and theparts associated with the sleeve 12 are moved along the bar 5 to aposition commensurate approximatel with the size of the parts to bemeasure The. points or tears 9 and 29 are then `disposed in the part tobe measured, the screw 13 is then tightened and the thimble of themicrometer is screwed or turned until the pointer 24` is coincident withthe line in the center of the arcuatey scale 23, it being remembered inthis connection that the member 22 is slidable and that movement of themember' 30 will by the connection described bring about movement of thepointer 24, whereupon the size of the part being measured may be read onthe barrel 1 Vof the micrometer. l

It will be apparent from the foregoing that by virtue of itsconstruction my improvement is accurate in the hands of an unskilledworkman which is manifestly an important advantage.

It will also be appreciated `from the foregoing that my improvement issimple and inexpensive in construction, and is free of delicate partssuch as are likel to get out of order after a short period o use.

I have entered into a detailed description of the construction andrelative arrangement of the parts embraced in the present and preferredembodiment of my invention in order to impart an exact understanding ofthe said embodiment in all of its details. I do not desire however to beunderstood as limiting myself to the constructionand relativearrangement of parts as disposed, my invention being defined by myappended claims within the scope ofwhich structural chan es ormodifications may be made Without eparture from m invention.

Having thus escribed the invention, what I claim is 1. A micrometerattachment comprising an arm attachable to a micrometer, a second armconnected with and adjustable relative to the first arm by itsengagement with a movable part of the micrometer, a movable vided withan arm op osito the first namedY arm, a inter pivote to said member, anda mova le arm connected to the arm of said member and engaged with andadapted to operatethe pointer and operable by a. mov-4 a i le part of amicrometer.

V3. A micrometer attachment comprising an arm adapted to be attached toone arm of the U-shaped' portion of a micrometer, a bar fixed to andextending from said arm, a sleeve movable on said bar, means foradjustably fixing the sleeve to the bar, a member attached to andmovable longitudinally of the sleeve, said member being provided with anarcuate scale, and being also provided with an arm opposite the lirstnamed arm, a pointer pivoted to said member, and

a movable arm connected to the arm of said.

member and engaged with and adapted to operate the pointer and operableYby a movable part of a micrometer; the said movable arm being aperturedto `receive said bar and to have sliding and pivotal movement thereon.

4. A Ymicrometer attachment comprising an arm adapted for. attachment toa portion of a micrometer, a bar fixed to and extending at ri ht anglesfrom the said arm, a .sleeve slida le on said bar and havi an aperturedprojection, meansfor adjustiibly fixing the sleeve to the bar, a memberattached to and movable longitudinally of said sleeve, said member beingequipped with an arcuate scale and being provided with an arm ofresilient character opposite the first named arm, a pointer pivoted tothe said member, a movable arm operable by a movable part of amicrometer and connected to the arm of said member and engaged with thesaid ointer, said resilient arm of the member liolding said member underyielding pressure against the movable arm, a rod connected to saidmovable arm andextending `throu h said apertured projection of thesleeve an having an abutment spaced from said aperture projection, and as ring mounted on said rod and interposed tweenthe apertured projectionof the sleeve and the enlargement of the rod.

5. A micrometer attachment comprising an arm equipped for attachment toa portion lli of a micrometer, a bar fixed to andextending at rightangles from the said arm, a sleeve slidable on said bar and having` anapertured projection, means for adjustably fixing the sleeve to the saidbar, a member attached to and movable longitudinally ot' said sleeve,said member being equipped with an arcuate scale and being provided withan arm of resilient character opposite the first named arm, a pointerpivoted to the said member, a movable arm operable by a movable part ofa 'micrometer and connected to the arm of said member and engaged withthe said pointer, said resilient arm of the lnember holding said memberunder yielding pressure against the movable arm, a rod connected to saidmovable arm and extending through said apertured projection of thesleeve and having an` abutment spaced from said apertured projection,and a spring mounted on said rod and interposed between the aperturedprojection of the sleeve and the enlargement of the rod; the said barbeing grooved, and the said movable arm apertured to receive thev barand provided with a stud disposed in the groove of the bar.

6. A micrometer attachment comprising an arm or bracket equipped forfixture on a micrometer, a bar fixed with respect to and extending fromthe said arm or bracket, means slidable on and capable of beingadjustably iixed to the said bar and equipped with a spring pressed orinfluenced element operable by a movable element of the micrometer; thesaid element being provided with a teat opposed to the movable elementof the micrometer, and the said teat being in the form of the head ofascrew detachably connected to the said element.

7. A micrometer attachment comprising an arm or bracket adapted to befixed to a portion .of a micrometer, abar extending from said arm orbracket, a sleeve mounted on said bar, means for adjustably fixing saidsleeve to the bar, a member attached to and movable longitudinallyrelative to the sleeve, said member equipped with a scale, a movablepointer complementary to said scale and carried by said member, and aspring influenced element operable by a movable part of a micrometer andengaged With and adapted to transmit movement to said pointer.

8. .A micrometer attachment comprising an armor bracket adapted to befixed to a portion of a micrometer, a bar extending from said arm orbracket, a sleeve mounted on said bar, means for adjustably fixing saidsleeve to the bar, a. member attached to and movable longitudinallyrelative to the sleeve,

said member equipped with a scale, aI mov-` able pointer complementaryto said scale and carried by said member, and a spring influencedelement operable by a movable part of a micrometer and engaged with andadapted to transmit movement to said pointer; the said element beingapertured and receiving said bar and being pivoted to and movablealongside the element carried by and movable longitudinally of thesleeve and therefore having sliding and pivotal movement on the bar.

In testimony whereof I aix my signature.

ROBERT W. OLSON.

